U.S. patent application number 12/746053 was filed with the patent office on 2010-10-14 for tool for the machining of workpieces.
This patent application is currently assigned to MAPAL FABRIK FUR PRAZISIONSWERKZEUG4E DR. KRESS KG. Invention is credited to Dieter Kress.
Application Number | 20100260558 12/746053 |
Document ID | / |
Family ID | 40547518 |
Filed Date | 2010-10-14 |
United States Patent
Application |
20100260558 |
Kind Code |
A1 |
Kress; Dieter |
October 14, 2010 |
TOOL FOR THE MACHINING OF WORKPIECES
Abstract
The invention relates to a tool (1) for machining workpieces,
having a base body (3), at least one geometrically defined culling
edge (15, 17) on which a face (21) abuts, a chip space (47, 53)
associated with the cutting edge for receiving the chips removed by
the cutting edge (15, 17), and a chip guide element (27, 29)
associated with the cutting edge (15, 17). The tool is
characterized in that the cutting edge (15, 17) together with the
chip guide element (27, 29) forms a receiving gap (43, 45) which
merges into the chip space (47, 53) and into which the chips
removed by the cutting edge (15, 17) are introduced, and the chip
guide element (27, 29) has a guide surface (39, 41) which, together
with the face (21), forms a receiving channel (51) which abuts the
receiving gap (43, 45).
Inventors: |
Kress; Dieter; (Aalen,
DE) |
Correspondence
Address: |
HARNESS, DICKEY & PIERCE, P.L.C.
P.O. BOX 828
BLOOMFIELD HILLS
MI
48303
US
|
Assignee: |
MAPAL FABRIK FUR
PRAZISIONSWERKZEUG4E DR. KRESS KG
Aalen
DE
|
Family ID: |
40547518 |
Appl. No.: |
12/746053 |
Filed: |
December 4, 2008 |
PCT Filed: |
December 4, 2008 |
PCT NO: |
PCT/EP08/10261 |
371 Date: |
June 3, 2010 |
Current U.S.
Class: |
407/11 ;
407/115 |
Current CPC
Class: |
B23D 77/02 20130101;
Y10T 408/89 20150115; B23B 29/034 20130101; Y10T 407/14 20150115;
Y10T 408/90993 20150115; B23B 2251/50 20130101; B23B 51/02
20130101; Y10T 408/909 20150115; Y10T 407/24 20150115 |
Class at
Publication: |
407/11 ;
407/115 |
International
Class: |
B23B 29/03 20060101
B23B029/03; B23B 27/22 20060101 B23B027/22; B23B 27/10 20060101
B23B027/10 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 6, 2007 |
DE |
10 2007 060 498.1 |
Dec 20, 2007 |
DE |
10 2007 063 207.7 |
Claims
1-17. (canceled)
18. A tool for machining workpieces, comprising: a base body; at
least one geometrically defined cutting edge on which a face abuts;
a receiving gap which merges into a chip space associated with the
cutting edge for receiving the chips removed by the cutting edge; a
receiving channel which abuts the receiving gap; and a chip guide
element associated with the cutting edge, the chip guide element
designed as a strip countersunk in the base body; wherein the
cutting edge and the chip guide element cooperate to form the
receiving gap into which the chips removed by the cutting edge are
introduced, and the chip guide element has a guide surface which,
together with the face, forms the receiving channel.
19. The tool according to claim 18, wherein the chip space,
starting from the receiving gap, is expanded at least in
places.
20. The tool according to claim 18, wherein the face and the guide
surface form an acute angle with respect to one another which
increases toward the chip space, starting from the receiving
gap.
21. The tool according to claim 18, wherein a width of the
receiving gap is smaller than a width of the adjacent chip
space.
22. The tool according to claim 18, wherein there is an axial
distance between a plane extending through the cutting edges,
parallel to the end face, and a plane defined by the front sides of
the chip guide elements, and the cutting edges project farther
beyond the end face than the front sides of the chip guide
elements.
23. The tool according to claim 18, wherein a width of the
receiving gap is in a range of 0.6 mm to 1.0 mm.
24. The tool according to claim 18, wherein a width of the
receiving gap is approximately 0.8 mm.
25. The tool according to claim 18, wherein the at least one
cutting edge is part of a cutting bit.
26. The tool according to claim 25, wherein the cutting bit may be
tangentially inserted into the end face of the tool.
27. The tool according to claim 25, further comprising an adjusting
device which cooperates with the at least one cutting bit or the
associated chip guide element.
28. The tool according to claim 27, wherein a width of the
receiving gap may be adjusted using the adjusting device.
29. The tool according to claim 18, wherein the strip is at least
partially constructed of a hard metal.
30. The tool according to claim 18, wherein the guide surface of
the chip guide element has a coating made of PCD.
31. The tool according to claim 18, wherein the chip space extends
along an imaginary helix.
32. The tool according to claim 18, wherein at least one guide
strip is provided.
33. The tool according to claim 32, wherein the guide strip is at
least partially constructed of PCD.
34. The tool according to claim 18, further comprising a
coolant/lubricant supply having at least one coolant/lubricant
channel.
35. The tool according to claim 34, wherein the at least one
coolant/lubricant channel of the coolant/lubricant supply opens
into the end face of the tool.
Description
[0001] The invention relates to a tool for machining workpieces
according to the preamble of claim 1.
[0002] Tools of this type are known, and are used, for example, for
machining the walls of hollow components. For example, when the
walls have a through opening in the machined area, chips removed
from the workpiece pass through this opening and into the cavity
enclosed by the walls. In many cases, for cast cylinder heads or
engine blocks of internal combustion engines, for example, it is
relatively complicated to remove the chips from the interior of the
workpiece. If the chips are not completely removed, this may result
in malfunction of an engine provided with the cylinder head or
engine block.
[0003] The object of the invention, therefore, is to provide a tool
of the aforementioned type which avoids this disadvantage.
[0004] This object is achieved by providing a tool having the
features stated in claim 1. This tool has a base body, at least one
geometrically defined cutting edge on which a face abuts, and a
chip space associated with the cutting edge. This chip space
receives the chips removed by the cutting edge. Lastly, the tool is
provided with a chip guide element which is associated with the
cutting edge, so that chips removed by the cutting edge strike the
chip guide element. The tool is characterized in that the cutting
edge together with the chip guide element forms a receiving gap,
into which the chips removed by the cutting edge are introduced.
The chip guide element has a guide surface which, together with the
face adjoining the cutting edge, forms a receiving channel. The
chips exiting through the receiving gap pass into this receiving
channel. The design of the tool which is selected here ensures that
chips removed from the cutting edge are guided and diverted in a
targeted manner into the receiving gap with the aid of the chip
guide element. The chip discharge defined in this manner ensures
that chips removed by the cutting edge are not able to pass
uncontrolled into the surroundings, i.e., in particular for the
machining of a hollow workpiece, into the interior thereof.
[0005] One preferred exemplary embodiment is characterized in that
the chip space, starting from the receiving gap, is expanded at
least in places. This design facilitates the further guiding of
produced chips into the chip space, and thus ensures that the chips
do not pass back into the machining area and possibly into a cavity
of a workpiece.
[0006] One particularly preferred exemplary embodiment of the tool
is characterized in that the width of the receiving gap is smaller
than the diameter of a helical chip produced by the cutting edge.
It has been shown that spiral-shaped chips, referred to as "helical
chips," are produced during the machining of workpieces. These
helical chips are discharged by the active cutting edge of the
tool, and in the region of the receiving gap collide with the guide
surface of the chip guide element, where they are diverted into the
receiving channel. As a result, chips removed from the workpiece
surface are guided into the chip space in a targeted manner and are
unable to pass back into the machining area.
[0007] Further embodiments result from the subclaims.
[0008] The invention is explained in greater detail with reference
to the drawings, which show the following:
[0009] FIG. 1 shows a first exemplary embodiment of a tool for
machining workpieces, in a perspective illustration;
[0010] FIG. 2 shows an enlarged detailed view of the tool
illustrated in FIG. 1;
[0011] FIG. 3 shows an end face view of the tool according to FIG.
1;
[0012] FIG. 4 shows a perspective front view of a second exemplary
embodiment of a tool; and
[0013] FIG. 5 shows an end face view of the tool according to FIG.
4.
[0014] FIG. 1 shows a first exemplary embodiment of a tool 1 having
a base body 3, which in the present case has different outer
diameters strictly by way of example. At least one cutting bit is
inserted into the end face 5 facing the observer. In the exemplary
embodiment illustrated, two cutting bits 7 and 9 are provided,
which in a manner of speaking are tangentially inserted into the
end face 5. That is, the front side 11 of cutting bit 7 and the
front side 13 of cutting bit 9 facing the observer extend
essentially parallel to the end face 5. Cutting bits 7, 9 are
actually slightly tilted, so that a border edge of the front side
11 or 13 projects somewhat beyond the end face 5. This border edge
forms a geometrically defined cutting edge 15 of cutting bit 7, and
a geometrically defined cutting edge 17 of cutting bit 9.
[0015] For machining a workpiece the tool 1 is set in rotation,
specifically, in the counterclockwise direction as shown in FIG. 1.
This is indicated by an arrow 19. In principle, the workpiece may
also be moved with respect to a stationary tool. The critical
factor is the relative motion between the workpiece and the cutting
edge 15 or 17.
[0016] Thus, during the rotary motion of the tool 1 chips are
removed by cutting edges 15 and 17, and are discharged on a face
which abuts the cutting edges. The face 21 associated with cutting
edge 15 may be seen in FIG. 1.
[0017] In the exemplary embodiment illustrated, the face 21 is
tilted about cutting edge 15; i.e., the face defines an angle
<90.degree. with respect to the front side 11 of cutting bit 7.
Such a design is referred to as a "positive rake angle."
[0018] The face associated with the cutting edge 17 of cutting bit
9 is not visible in the illustration according to FIG. 1.
[0019] In the exemplary embodiment illustrated, the cutting bits of
the tool 1 have a quadrilateral design by way of example. The
cutting bits may be turned about the center axis of a clamping
screw when a cutting edge becomes worn.
[0020] A clamping screw 23 which is countersunk in the front side
13 of cutting bit 7 is associated with cutting bit 7. Similarly, a
clamping screw 25 which is countersunk in the front side 13 of
cutting bit 9 is associated with cutting bit 9.
[0021] In principle, it is also possible to carve out cutting edges
15 and 17 in question directly from the base body of the tool 1.
However, it is more economical, as described here, to use cutting
bits 7, 9 having corresponding cutting edges 15, 17.
[0022] A chip guide element 27 is associated with cutting bit 7 at
a distance therefrom; a chip guide element 29 is correspondingly
associated with cutting bit 9. The chip guide elements 27 and 29
are designed as strips which are countersunk in the base body 3.
The chip guide elements are suitably affixed, preferably
hard-soldered. They may also be anchored in the base body 3 of the
tool 1 using screws or clamps.
[0023] The chip guide elements 27 and 29 have a front side 31, 33,
respectively, which in the present case is in flush abutment with
the end face 5 of the tool 1 by way of example. Viewed in the
direction of the center axis 35 of the tool 1 and in the direction
of the feed direction indicated by a double arrow 37, cutting edges
15 and 17 lead with respect to the front sides 31 and 33 of chip
guide elements 27 and 29. In any event, it is essential that
cutting edges 15 and 17 project farther beyond the end face 5 of
the tool 1 than the front sides 31 and 33. In particular, the axial
distance between a plane extending through cutting edges 15 and 17,
parallel to the end face 5, and a plane defined by the front sides
31 and 33 of chip guide elements 27 and 29 must be greater than the
advance which the tool 1 undergoes during one revolution relative
to the workpiece.
[0024] In one particularly preferred embodiment of the tool 1, it
is provided that the axial distance between the planes in which
cutting edges 15 and 17 and the front sides 31 and 33 of chip guide
elements 27 and 29 are situated is in a range from .gtoreq.0.2 mm
to 0.6 mm. In other words, viewed in the feed direction, the
cutting edges lead in front of the front sides by .gtoreq.0.2 mm to
0.6 mm. A leading of 0.4 mm is particularly preferred. These values
apply for a feed rate of 0.2 mm per revolution of the tool 1.
[0025] The values given here for the leading of the cutting edges
with respect to the front sides of the chip guide elements are
selected for a tool 1 which has two cutting edges. However, if only
one cutting edge should be present, the leading must be selected to
be twice this value.
[0026] A guide surface 39 is provided on the side of the chip guide
element 27 facing cutting bit 7. Correspondingly, chip guide
element 29 has a guide surface 41 on its side facing cutting bit
9.
[0027] Between the cutting edges 15 and 17 of the cutting bits and
the associated chip guide elements 27 and 29, a receiving gap 43,
45 is respectively formed, into which chips removed by cutting
edges 15 and 17 enter.
[0028] In one preferred exemplary embodiment of the tool 1 it is
provided that the width of the gap (measured in the circumferential
direction 19), i.e., the distance between cutting edges 15 and 16
of the cutting bits and the chip guide elements 27 and 29, is in a
range from 0.6 mm to 1.0 mm. A width of 0.8 mm is particularly
preferred.
[0029] It is also shown in FIG. 1 that a chip space 47 is
introduced in the base body 3 of the tool 1 which accommodates the
chips removed by the cutting edge 15. Correspondingly, a chip space
is associated with the cutting edge 17 of cutting bit 9, of which
only a discharge area 49 is visible here.
[0030] FIG. 2 shows the front section of the tool 1 as illustrated
in FIG. 1. Identical and functionally equivalent parts are provided
with the same reference numerals, so that in this regard reference
is made to the description for FIG. 1.
[0031] FIG. 2 shows once again that the tool 1 is provided with two
cutting bits 7 and 9 by way of example. These cutting bits are
tightened, essentially opposite one another in the end face 5 of
the tool 1, by means of the clamping screws 23 and 25 described
above. The following description concerns only the upper cutting
bit 7 in FIG. 2. All statements in this regard correspondingly
apply to the lower cutting bit 9.
[0032] The enlarged view clearly shows that cutting edge 15 forms
the intersection line between the front side 11 and the face 21 of
cutting bit 7. The cutting edge is situated at a distance from the
guide surface 39 of the chip guide element 27, and preferably
extends essentially parallel thereto, so that in this case the
receiving gap 43 is formed with parallel border lines.
[0033] The face 21 preferably defines an acute angle with respect
to the guide surface 39, the angle opening toward the chip space
47, starting from the receiving gap 43. A receiving channel 51 is
thus formed between the face 21 and the guide surface 39, in which
the chips removed by cutting edge 15 and guided through the
receiving gap 43 are received. From the receiving channel 51 the
chips exit into the further chip space 47.
[0034] The chip guide element 27 is situated with respect to
cutting bit 7 in such a way that the course of the chips removed by
the cutting edge 15 is influenced in a defined manner: the chips
collide with the guide surface 39 of the chip guide element 27. The
chip guide element is situated close enough to cutting bit 7, i.e.,
the receiving gap 43 has such a narrow design, that the chips
collide with the guide surface 39 and are guided by same into the
receiving channel 51, and from there into the chip space 47. It is
known that a chip produced by a cutting edge on the face 21 is
basically discharged to the rear, i.e., opposite the feed
direction. The chip has the tendency to separate from the face and
form a curl. In practice it has been shown that this curl is able
to migrate in the feed direction and protrude in an uncontrolled
manner beyond the end face 5 of the tool 1. Use of the chip guide
element 27 ensures that the curls are diverted to the rear, i.e.,
opposite the feed direction, and are thus guided into the receiving
channel 51.
[0035] This targeted influencing of the chip discharge ensures that
chips removed by the cutting edge 15 are not discharged in the feed
direction indicated by the arrow 37, but instead are diverted
opposite the feed direction and reliably guided into the chip space
47.
[0036] With reference to FIG. 2, it is noted once again that the
width of the receiving channel 51, i.e., the distance of the
cutting edge 15 and the associated face 21 from the chip guide
element 27 or the guide surface 39 thereof, is selected in such a
way that chips removed from the workpiece are captured in the
receiving gap 43 and receiving channel 51 and diverted into the
chip space 47.
[0037] When the tool 1 is used for machining openings in walls of a
workpiece which enclose a cavity, the targeted influencing of the
chip discharge ensures that during machining of the workpiece no
chips pass into the cavity thereof and impair the function of the
workpiece itself or related elements. In addition, after machining
a hollow workpiece there is no need for complicated cleaning
operations, since the chips removed from the tool 1 are reliably
diverted from the machining area and guided in a targeted manner
into the chip space 47.
[0038] This is advantageous, for example, in the production of
machined seats, commonly known as "water plug holes," for the
closure caps of coolant circuits or water circuits in engine blocks
or cylinder heads.
[0039] FIG. 3 shows the tool, explained with reference to FIGS. 1
and 2, in a top view. Identical and functionally equivalent parts
are provided with the same reference numerals, so that in this
regard reference is made to the description for FIGS. 1 and 2.
[0040] The tool 1 has a symmetrical design. Cutting bit 9 is
situated opposite from cutting bit 7. The cutting bits are
tightened by clamping screws 23 and 25 in the base body 3 of the
tool 1. Symmetrical chip spaces are associated with the cutting
bits, chip space 47 being associated with cutting bit 7, and chip
space 53 being associated with the discharge area 49 of cutting bit
9.
[0041] From this perspective it may be clearly seen that a
receiving gap 43 and 45 is respectively provided between cutting
bits 7 and 9 and associated chip guide elements 27 and 29, into
which the chips removed by the cutting edges 15 and 17 enter and
are discharged perpendicularly into the image plane of FIG. 3.
[0042] The cutting edges 15 and 17 of cutting bits 7 and 9 end at a
distance from the center axis 35 of the tool 1. Thus, the tool is
designed only to machine a workpiece having an existing borehole.
Machining into solid material is therefore not possible.
[0043] FIG. 4 shows a modified exemplary embodiment of the tool 1.
Identical and functionally equivalent parts described with
reference to the first exemplary embodiment are provided with the
same reference numerals. In this regard, reference is made to the
preceding figures.
[0044] The tool 1 has a base body 3, in the end face 5 of which two
cutting bits 7 and 9 are once again countersunk practically
tangentially, so that the respective front sides 11 and 13 of the
cutting bits extend essentially parallel to the end face 5. This
illustration clearly shows that an angle <90.degree. is in fact
defined between the front side 11 and the face 21 of cutting bit 7.
Cutting bit 7 is accommodated in a recess 55 in the base body 3 of
the tool 1, the base of the recess being inclined relative to the
end face 5 in such a way that the cutting edge 15 of cutting bit 7
projects farther beyond the end face 5 than the oppositely situated
border edge 15' of cutting bit 7. As stated, cutting bit 7 is
designed as an indexable insert. It is also possible to loosen the
clamping screw 23 and turn the cutting bit about the center axis of
the clamping screw so that the border edge 15' of the clamping
screw contacts the location of the cutting edge 15, and is thus
able to act as an active cutting edge.
[0045] From the illustration according to FIG. 4 showing the tool 1
in a perspective front view, it can be seen that the cutting bit 9,
in this case on the bottom, is situated at the outside edge of the
end face 5, while cutting bit 7 is situated in such a way that its
cutting edge 15 extends to the center axis 35 of the tool 1.
Together, the cutting edge 15 of cutting bit 7 and the cutting edge
17 of cutting bit 9 cover a working area which allows use of the
tool 1 for machining into solid material.
[0046] The exemplary embodiment of the tool 1 illustrated here has
an additional cutting bit 57 which is inserted into the
circumferential surface 59 of the base body 3 of the tool 1
adjacent to the end face 5, and has a cutting edge 61 with which a
bevel, for example, may be produced or machined. For this purpose
the cutting edge 61 projects beyond the circumferential surface
59.
[0047] The remaining design of the tool 1 according to FIG. 4
essentially corresponds to the exemplary embodiment according to
FIGS. 1 through 3. Thus, here as well it is provided that a
receiving gap 43 is formed between the cutting edge 15 of cutting
bit 7 and the guide surface 39 of the chip guide element 27, into
which chips which are removed by the cutting edge 15 enter and are
guided via a receiving channel into the chip space 47.
[0048] A corresponding receiving gap 45 is formed between cutting
bit 9 and the chip guide element 29.
[0049] It may be clearly seen that the width of receiving gap 43 is
greater than the width of receiving gap 45. The gap width is
adjusted to the chips removed by the respective cutting edges 15
and 17. The defined width of the receiving gaps 43 and 45 ensures
that no chips exit in the direction of the feed direction denoted
by double arrow 37 during machining of a workpiece.
[0050] For the machining of a workpiece, the relative speed between
the workpiece surface and cutting edge 17 is greater than that
between the workpiece surface and cutting edge 15. Thinner chips
are therefore removed by cutting edge 17, which roll up in a spiral
fashion during discharge from cutting edge 17, resulting in
so-called helical chips.
[0051] During machining of a workpiece, the cutting edge 15 of
cutting bit 7 situated farther from the center axis 35 has a lower
relative speed compared to cutting edge 17, so that at this
location thicker chips are removed, which are rolled up into
helical chips having a larger diameter.
[0052] Matching the width of receiving gaps 43 and 45 specifically
to the helical chips ensures that chips removed by the cutting
edges are forced through receiving gaps 43 and 45 and the
associated receiving channels, and into the respective chip spaces
47 and 53. Thus, even for machining into solid material it is
ensured that no chips exit to the front in the feed direction via
the end face 5. If a borehole is produced and machined in the wall
of a hollow workpiece, when the tool 1 passes through the wall no
chips pass into the cavity in the workpiece enclosed by the
wall.
[0053] Thus, it is ensured that the advantages resulting from the
exemplary embodiment of the tool 1 explained according to FIGS. 1
through 3 are also realized for this embodiment of the tool 1
illustrated in FIG. 4.
[0054] A coolant/lubricant supply is provided in the exemplary
embodiment of the tool 1 illustrated in FIG. 4. The appropriate
medium is conveyed through the base body 3 of the tool 1 into the
region of the active cutting edges. Shown by way of example in FIG.
4 are outlet openings A1 and A2, from which the coolant/lubricant
exits during use of the tool 1. It may be seen that in this case
the outlet openings A1 and A2 open into the end face 5 of the tool
1. An outlet opening may also be associated with the cutting bit 57
so that this cutting bit as well may be supplied with
coolant/lubricant.
[0055] Lastly, FIG. 5 shows the tool 1 illustrated in FIG. 4 in an
end face view. Identical and functionally equivalent parts
described with reference to FIGS. 1 through 4 are provided with the
same reference numerals. In this regard, reference is made to the
description for the preceding figures.
[0056] In this case it is once again clear that the distance of
cutting bit 7 from the associated chip guide element 27 is greater
than the distance of cutting bit 9 from the associated chip guide
element 29. Thus, the receiving gap 43 in the region of the first
cutting bit 7 is wider than the receiving gap 45 in the region of
the second cutting bit 9.
[0057] The illustration according to FIG. 5 also shows that the
third cutting bit 57, the same as cutting bits 7 and 9, is
tangentially inserted into the outer face of tool 1, and in the
present case is inserted into the circumferential surface 59 of the
base body 3.
[0058] From the explanations for FIGS. 1 through 5 it is clear that
the tool 1 described here is characterized in that chips, in
particular the helical chips, removed by the at least one cutting
edge, in the present case by cutting edges 15 and 17, are not
discharged in the direction of the feed direction indicated by the
double arrow 37, but instead are captured in the associated
receiving gaps 43 and 45 and pass via receiving channels into the
chip spaces of the cutting bits. It is also shown that the design
of the tool is relatively simple, resulting in cost-efficient
implementation of the object stated herein.
[0059] To reduce the wear on the chip guide elements 27 and 29, at
least the respective guide surface 39, 41 thereof which faces
cutting bits 7, 9 and on which the chips removed by cutting edges
15, 17 are discharged are coated with a resistant material, whether
hard metal or PCD. The chip guide elements 27 and 29 are preferably
composed entirely of hard metal. The chip guide elements are
soldered into the base body 3 of the tool 1 or affixed in some
other suitable manner.
[0060] It is further noted that the tool 1 may be provided with at
least one guide strip, at least in the circumferential region
adjoining the end face 5, by means of which the tool is supported
on the machined or produced borehole wall during machining of a
workpiece.
[0061] On its exterior with which it comes into contact with the
workpiece the at least one guide strip is coated with a hard
material such as PCD, for example, and is preferably composed
entirely of PCD. The guide strip is glued into the base body 3 of
the tool 1, or is affixed thereto in some other suitable
manner.
[0062] An adjusting device is preferably provided to ensure an
optimal width of the receiving gaps 43, 45. This adjusting device
may act on the chip guide elements 27 or 29, but preferably acts on
cutting bits 7 and 9. It is also possible to provide both parts
with adjusting devices in order to influence the width of the
receiving gap.
[0063] Lastly, the tools 1 may be provided with a coolant/lubricant
feed line via which coolant/lubricant enters the machining area of
the cutting edges. With regard to the cutting edges 15 and 17 of
cutting bits 7 and 9, it is important that these are situated in
the region of the receiving gap 43, 45. The receiving gaps are
adjoined by a preferably expanding receiving channel 51 which
merges into the associated chip space. Since the receiving gap is
the narrowest region into which the chips removed by the cutting
edges 15 and 17 enter, at this location this results in a maximum
flow rate of the coolant/lubricant, so that the targeted diversion
of the chips from the cutting edges 15 and 17 into the associated
chip space is facilitated.
[0064] It is clear from the present discussion that the tool 1 may
be provided with one or also more than two cutting edges. It is
also obvious that a receiving gap for the targeted diversion of the
chips from a workpiece may also be provided in the circumferential
region of a tool.
* * * * *